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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Provision at statutory rate	$ 32,861	$ 42,510	$ 64,943	$ 81,995
Tax-exempt income:
Tax-exempt interest	(5,027)	(4,605)	(9,985)	(9,091)
Section 291/265 interest disallowance	957	532	1,841	918
Company-owned life insurance income	(1,178)	(945)	(1,872)	(1,572)
Tax-exempt income	(5,248)	(5,018)	(10,016)	(9,745)
State income taxes	6,333	8,552	11,480	16,693
Interim period effective rate adjustment	(70)	993	873	(723)
Tax credit investments - federal	(3,106)	(2,526)	(6,160)	(5,051)
Officer compensation limitation	1,491	1,040	2,256	2,080
Non-deductible FDIC premiums	2,032	2,037	3,779	4,147
Other, net	957	(195)	583	(582)
Income tax expense	$ 35,250	$ 47,393	$ 67,738	$ 88,814
Effective tax rate	22.50%	23.40%	21.90%	22.80%

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